I found this on Ebay and they are using the Berillium intake seats and Ti intake valves, they guarantee it from zeroing out! If it does they will fix if for free fro the lifetime of the bike!!! So after doing the top end numerous times in 2.5 years from heavy desert use I need to find a cure for it. I have noticed they do not hold up well to sustained high RPM use. I have seen the guys claiming that they can get 100+ hours before needed an adjustment, Not in my case, I am lucky to get 100 out of them period! I keep my air filters clean and oiled, etc. No matter what they still zero out. This company claims to have the answer and guarantees them for life (to the original customer). If it goes out more than 3 shim sizes they will fix it free! I am all over this. Anybody else tried these guys and have any reviews? They have 100% satisfaction via Ebay, so thats quite a feat in itself!